EP2107954B1 - Abstreifanordnung - Google Patents

Abstreifanordnung Download PDF

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Publication number
EP2107954B1
EP2107954B1 EP04740208A EP04740208A EP2107954B1 EP 2107954 B1 EP2107954 B1 EP 2107954B1 EP 04740208 A EP04740208 A EP 04740208A EP 04740208 A EP04740208 A EP 04740208A EP 2107954 B1 EP2107954 B1 EP 2107954B1
Authority
EP
European Patent Office
Prior art keywords
fingers
punch
stripping
stripping assembly
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04740208A
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English (en)
French (fr)
Other versions
EP2107954A1 (de
Inventor
William Woulds
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crown Packaging Technology Inc
Original Assignee
Crown Packaging Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crown Packaging Technology Inc filed Critical Crown Packaging Technology Inc
Priority to EP04740208A priority Critical patent/EP2107954B1/de
Publication of EP2107954A1 publication Critical patent/EP2107954A1/de
Application granted granted Critical
Publication of EP2107954B1 publication Critical patent/EP2107954B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices

Definitions

  • This invention relates to a stripping assembly.
  • it relates to a stripper for removal of a tubular article, such as a can body, from a close-fitting mandrel on which the article is carried, for example for forming.
  • Stripping devices are in general use for stripping thin-walled cans from a punch or ram on which such cans have been formed in a "draw and wall-ironing" (“DWI") process.
  • These strippers typically comprise an annulus of stripping fingers. The annulus is situated within a die assembly such that radially inward ends of the fingers extend into the bore of the assembly through which the punch passes during the DWI process.
  • the stripper fingers are biased inwardly so that on the forward, can forming, stroke of the punch, the can formed and carried on the punch deflects the stripping fingers against the biasing force as the can moves along the bore through the fingers. After the can has moved axially beyond the fingers, the biasing force causes the fingers to be deflected against the punch itself. As the punch moves on the return stroke, the fingers prevent the can from moving with the punch and the can is stripped from the punch.
  • the biasing force for deflecting the fingers has been provided by a variety of spring devices, most conventionally by the use of an 'O' ring of resilient material, although other biasing devices, for example a continuous helical spring or using hydraulics, are also possible.
  • a known stripping assembly which uses an O-ring for biasing respective stripping fingers is described in GB-B-2,181,685 .
  • the O-ring in this patent encircles the stripping fingers and is compressively trapped between the fingers and an outer opposing part of an annular housing.
  • the O-ring further causes the fingers to rest on seating parts of the housing so as to limit the extent to which the tips of the fingers, which engage the can, protrude from the housing.
  • Known stripping devices have several drawbacks, particularly when high manufacturing speeds are used. If excessive pressure is used to strip the can during the return stroke, the open end of the can may be spoiled and the punch may even be damaged. During the forward stroke, the coating on the can surface is often scratched as the stripper fingers are forced open by the can carried on the punch. Although the stripping assembly of GB-B-2,181,685 is said to apply only a light pressure to the surface of the can and/or punch, it has nonetheless been found that small scratches are made on the can surface as the stripper fingers are forced open by the can carried on the punch on its forward stroke.
  • JP 2003 103312 shows a stripping device which uses a cam actuation to move the stripping fingers away from the can surface on the forward stroke of the punch. Not only does this device require externally moving parts in the form of the cam and cam followers but it also requires external energising to move the fingers into the stripping position on the return stroke of the punch.
  • the stripper may be used in conjunction with an air strip in which pressurised air passes along the centre of the punch to assist in can removal and avoid formation of a vacuum which could cause can collapse.
  • the fingers are resiliently mounted on an 'O'-ring or cord item.
  • the stripping assembly of the present invention is particularly suitable for use with steel cans which are coated or laminated, for example with a polymer.
  • the actuator comprises a piston operated by fluid pressure.
  • the fingers include a bottom and top portion within the housing, the top portion contacting a lip about which the fingers pivot on the forward stroke as the pivot pushes the bottom of fingers outwards.
  • the biasing device may typically comprise an O-ring or spring, such as a garter spring.
  • the actuator piston is situated in an upstream portion and the biasing device (O-ring) in a downstream portion.
  • the actuator may further comprise compressed air or fluid which may be operated by a solenoid and timed by a signal from the bodymaker.
  • the stripping assembly 10 is shown in the figures in its "at rest" state.
  • the assembly includes a hollow annular housing 32 defining a central bore 5 of the bodymaker 1.
  • DWI draw and wall ironing
  • the housing 32 comprises a pair of complementary upstream and downstream annular shells 36, 38 which are secured face to face to define an annular chamber.
  • a ring of stripper fingers 12 is disposed within the annular chamber of the housing, the tips 34 of the fingers extending from the housing 32 radially inwards into the bore 5.
  • the fingers 12 include a bottom 26 and top 27 portion within the housing 32.
  • the fingers 12 may be of carbide, ceramic or steel, for example. Carbide fingers avoid scoring of the punch on the return stroke if no lubrication is used as, for example, when the can has a polymer coating which could be affected by some lubricants.
  • An O-ring 20 is disposed between the downstream shell 38 of the housing and the fingers 12. This O-ring 20 biases each stripper finger 12 radially inwardly into the bore 5.
  • the fingers 12 are separated circumferentially by needle bearings 40 as shown in the top part of figure 1 and the portion 30 of figure 2 in which a finger has been removed for clarity.
  • a further O-ring or cord item 42 in the upstream shell 36 allows the fingers to conform to the shape of the top edge of the can for stripping.
  • This 'O'-ring 42 enables the fingers to tilt sideways so that the maximum surface area at the tip of each finger is presented to the top edge of the can. This is particularly important since drawing and wall-ironing a can body results in an uneven edge on the can body.
  • the stripper By enabling the stripper fingers to rock, the stripper self-aligns according to the shape of the can edge.
  • the fingers are kept “square" and not allowed to tilt. Consequently, the fingers hit the nearest part of the edge of the can body, typically resulting in bending or fracturing that part of the edge. The resultant debris can cause damage to can bodies and/or the surface of the punch.
  • the stripper assembly 10 of the present invention provides a novel method of activating the stripper fingers so that the fingers are moved out of the path of a can which is carried on the punch and passes through the fingers.
  • a piston 14 is disposed in the upstream shell 36 of the housing. The piston 14 is actuated by pressurised air or fluid controlled by a solenoid valve (not shown) which is timed by a signal from the bodymaker 1.
  • the forward stroke of the punch is coupled to the bodymaker timing unit, which triggers a supply of pressurised air/fluid on the forward stroke to the piston.
  • the piston When pressurised, the piston moves forward (downstream) until it contacts the "bottom” or radially inner portion 26 of the fingers 12. Further forward motion of the piston pushes against the radially inner portion (bottom) of the finger. As the finger is restrained from moving outwardly, the radially outer ("top") portion 27 of the finger pivots about the lip of the downstream shell or retainer cap 38, at contact point 16. Pivoting of the finger in an arc about the lip 16 thus lifts the tip 34 of each finger clear of the incoming punch.
  • Pivoting of the stripper fingers 12 compresses O-ring 20 and opens the fingers against the biasing force of the O-ring.
  • the gap 28 between the retainer cap 38 and radially outer portion 27 of the fingers is open when the fingers are released by the piston and are in contact with the punch, this ensures positive contact.
  • the gap 28 increases as the fingers pivot forward when the stripper is activated to let the can pass through.
  • the gap is closed by the O-ring as the punch is withdrawn, thus acting as a stop.
  • the solenoid switches off the air/fluid supply to the piston 14 and O-ring 20 pushes the piston back, allowing the fingers 12 to close on the punch for the return stroke.
  • the stripping fingers are in contact with the punch so that they engage the rear end edge of the can and movement of the can with the punch is resisted.
  • the stripping fingers are allowed to tilt due to being resiliently mounted on 'O'-ring 42. This self-alignment prevents fracture of the uneven edge of the can. The can is then separated from the punch in conventional manner.
  • the piston is situated at the front (downstream side) of the finger and a guide ring 50 is included in the rear (upstream side)of the stripper body 32.
  • the O-ring 20 closes the gap 44 (typically 0.2 mm) and holds the finger 12 against the stripper body.
  • the piston 54 located in the retainer cap 38 moves outwards and the fingers 12 rock backwards pivoting around the contact point 58 against the stripper body. This causes the tips of the stripper fingers to lift clear of the incoming punch.
  • Air is supplied in the same way as in the embodiment of figure 1 , via a solenoid actuated from an electrical signal from the bodymaker.
  • the finger 12 has a chamfer behind the pivot point 58 to allow it to rock backwards.
  • O-ring 20 When the air is turned off the O-ring 20 closes the fingers against the punch. Springs 52 increase the speed at which the fingers close.
  • O-ring 42 allows the fingers to conform to the shape of the top edge of the can as in the first embodiment. There are sixteen segments as in the first embodiment and these are separated with the similar pins 40.
  • Guide ring 50 limits oscillation of the punch as it leaves the last ironing die. The punch will then contact the dome station more centrally and help to reduce the occurrence of split domes. The guide ring 50 also guides the back edge of the punch to keep it more central at the point of stripping. Ring 50 can be made from a number of materials which are selected so as not to mark the can on the punch, depending on the material from which the can (and/or its coating) is made. The ring can also be extended back into the stripper housing void if required to prevent build up of debris.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Punching Or Piercing (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Lubricants (AREA)

Claims (11)

  1. Abstreifanordung (10) zum Abstreifen einer Dose von einem Stempel in einer Maschine (1) zur Dosenherstellung, bestehend aus:
    einer Vielzahl von entlang des Umfangs eines ringförmigen Gehäuses (32) angeordneten Abstreiferfingern (12),
    einer Vorspanneinrichtung (20), die dazu bestimmt ist, die Spitzen (34) der Finger (12) ausgehend von dem Gehäuse (32) radial einwärts in einer zentralen Bohrung (5) der Maschine (1) unter Vorspannung zu setzen und
    einer innerhalb des Gehäuses (32) angeordneten Betätigungseinrichtung (14, 54), welche dann, wenn der Stempel während eines Vorwärtshubes eine Dose durch die Bohrung hindurchträgt eine jede der Fingerspitzen von der durch den Stempel getragenen Dose abhebt, und zwar entgegen der Wirkung der Vorspanneinrichtung (20) und welche während des Rückwärtshubes des Stempels funktionslos ist, so dass sich die Fingerspitzen mittels der Vorspanneinrichtung (20) schließen und die Dose von dem Stempel abgestreift wird,
    dadurch gekennzeichnet, dass die Finger (12) zum Zweck einer Selbstausrichtung mit der Schnittkante der Dose während des Rückwärtshubes des Stempels elastisch angeordnet sind (42) und
    dass die Betätigungseinrichtung (14, 54) einen Kolben umfasst.
  2. Abstreifanordnung nach Anspruch 1, wobei die Finger in elastischer Weise auf einem O-Ring oder einem Schnurteil (42) angeordnet sind.
  3. Abstreifanordnung nach Anspruch 1 oder 2, wobei die Finger (12) einen inneren (26) und äußeren Abschnitt (27) innerhalb des Gehäuses aufweisen, wobei der äußere Abschnitt (27) eine Lippe (16) aufweist, um welche die Finger (12) während des Vorwärtshubes schwenken können, sobald der Kolben (14) den inneren Abschnitt (26) der Finger (12) schiebt.
  4. Abstreifanordnung nach einem der Ansprüche 1 bis 3, wobei die Betätigungseinrichtung (14) in einem stromaufwärts gelegenen Teil angeordnet ist und wobei die Vorspanneinrichtung (20) in einem stromabwärts gelegenen Teil angeordnet ist.
  5. Abstreifanordnung nach Anspruch 1 oder 2, wobei die Finger (12) einen inneren (56) und einen äußeren Abschnitt (57) innerhalb des Gehäuses aufweisen, wobei der innere Abschnitt (56) einen Punkt (58) kontaktiert, um den die Finger (12) während des Vorwärtshubes schwenken können, sobald der Kolben (54) den äußeren Abschnitt (57) der Finger (12) schiebt.
  6. Abstreifanordnung nach Anspruch 5, wobei die Betätigungseinrichtung (54) sich in einem stromabwärts gelegenen Teil befindet.
  7. Abstreifanordnung nach Anspruch 5 oder 6, welche ferner einen Führungsring (50) umfasst.
  8. Abstreifanordnung (10) nach einem der Ansprüche 1 bis 7, wobei die Vorspanneinrichtung (20) aus einem O-Ring oder einer Feder besteht.
  9. Abstreifanordnung nach einem der Ansprüche 1 bis 8, wobei die Betätigungseinrichtung (14) ferner Druckluft oder ein Fluid umfasst.
  10. Abstreifanordnung nach einem der Ansprüche 1 bis 9, wobei der Fluss der Druckluft oder des Fluids durch ein Magnetventil gesteuert ist, welches durch ein Signal der Maschine (1) getaktet wird.
  11. Verfahren zum Abstreifen einer Dose von einem Stempel in einer Maschine (1) zur Dosenherstellung mit einer Abstreifanordnung (10), welche eine Vielzahl an Fingern (12) und eine Vorspanneinrichtung (20) umfasst, die dazu bestimmt ist, die Spitzen der Finger (12) in der Bohrung (5) der Maschine (1) unter Vorspannung zu setzen, bestehend aus einer
    Bereitstellen einer Betätigungseinrichtung (14) und einem Anheben einer jeden der Spitzen (34) der Finger von der auf einem Stempel getragenen Dose entgegen der Wirkung der Vorspanneinrichtung (20), sobald der Stempel während des Vorwärtshubes eine Dose durch die Bohrung (5) hindurch trägt
    sowie einem Inaktivieren der Betätigungseinrichtung, sobald sich der Stempel auf dem Rückwärtshub befindet und Schließen der Fingerspitzen (34) mittels der Vorspanneinrichtung (20), um die Dose von dem Stempel abzustreifen, dadurch gekennzeichnet,
    dass die Betätigungseinrichtung einen Kolben aufweist und dass das Verfahren ferner aus einem
    Betätigen der Finger mittels des Kolbens (14) während des Vorwärtshubes und
    einem Selbstausrichten der Finger (12) nach Maßgabe der Gestalt der Dose besteht, indem ein O-Ring oder ein Schnurteil (42) während des Rückwärtshubes des Stempels benutzt wird.
EP04740208A 2003-07-23 2004-06-23 Abstreifanordnung Expired - Lifetime EP2107954B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04740208A EP2107954B1 (de) 2003-07-23 2004-06-23 Abstreifanordnung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03255213 2003-07-23
PCT/EP2004/006788 WO2005014197A1 (en) 2003-07-23 2004-06-23 Stripping assembly
EP04740208A EP2107954B1 (de) 2003-07-23 2004-06-23 Abstreifanordnung

Publications (2)

Publication Number Publication Date
EP2107954A1 EP2107954A1 (de) 2009-10-14
EP2107954B1 true EP2107954B1 (de) 2010-10-27

Family

ID=34130336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04740208A Expired - Lifetime EP2107954B1 (de) 2003-07-23 2004-06-23 Abstreifanordnung

Country Status (7)

Country Link
US (1) US7243520B2 (de)
EP (1) EP2107954B1 (de)
AT (1) ATE485901T1 (de)
DE (1) DE602004029835D1 (de)
DK (1) DK2107954T3 (de)
ES (1) ES2354803T3 (de)
WO (1) WO2005014197A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101476238B1 (ko) * 2007-04-25 2014-12-24 도요세이칸 그룹 홀딩스 가부시키가이샤 드로잉·아이어닝 캔 성형 장치용 스트리퍼 장치
DE102010019322B4 (de) * 2010-05-03 2012-02-16 Schuler Pressen Gmbh & Co. Kg Abstreifring
AU2012223125B2 (en) * 2011-02-21 2016-09-08 Grail Inventions (Pty) Ltd. A mould assembly.
CN104972013B (zh) * 2015-07-14 2017-01-04 深圳市精创科技有限公司 一种多工位级进模内快速取件机械手

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1537318A (en) * 1976-06-11 1978-12-29 Metal Box Co Ltd Stripping apparatus
US4606215A (en) * 1985-07-08 1986-08-19 Pac International, Inc. Apparatus and method for stripping workpieces
GB8524514D0 (en) * 1985-10-04 1985-11-06 Metal Box Plc Tubular articles
US5115662A (en) * 1991-07-02 1992-05-26 Coors Brewing Company Apparatus for stripping workpieces
JP3858651B2 (ja) * 2001-09-26 2006-12-20 東洋製罐株式会社 絞り・しごき加工される缶胴体用ストリッパ装置

Also Published As

Publication number Publication date
WO2005014197A1 (en) 2005-02-17
EP2107954A1 (de) 2009-10-14
ES2354803T3 (es) 2011-03-18
DK2107954T3 (da) 2010-12-13
DE602004029835D1 (de) 2010-12-09
US20060174676A1 (en) 2006-08-10
US7243520B2 (en) 2007-07-17
ATE485901T1 (de) 2010-11-15

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